Teresa Gollihugh, her mother Keren Blake, and a friend, Mollie Blumberg, are accused of plotting to rob an alleged pot dealer in Novato. (Marin County Jail)

A discharged Coast Guard employee and her mother pleaded not guilty Tuesday to robbing a Novato man on Halloween morning, even though the daughter admitted the costumed caper was a plot to steal marijuana, according to court documents.

Teresa Leanne Gollihugh, 20, and Keren Ann Blake, 39, appeared with their appointed lawyers Tuesday morning before Judge Andrew Sweet. A third suspect, Mollie Anna Blumberg -- the alleged conspirator who wore a pixie costume -- will be arraigned on related charges Wednesday.

The women are accused of planning the armed robbery of David Murray Randolph at his home in the 2400 block of Center Road in Novato. Randolph suffered numerous injuries -- including a 5-inch cut to his head that required 22 stitches -- after he was allegedly struck by beer bottles, a metal lamp, a coffee mug and glass from a shattered bong, police said.

The alleged home invasion robbery occurred at about 2 a.m. Oct. 31. Randolph, 46, told police a woman came to his door, said she was trying to get away from her boyfriend, and asked to borrow his cellphone to call a friend, according to an affidavit by Novato police Detective Steven Cogan.

Randolph said the woman was wearing a "fairy"-type costume with dark wings, a dark shirt and a green skirt. He let her in and gave her his cellphone.

Then a second woman burst in and said to the pixie, "Oh my god, are you OK?" according to the affidavit. A short time later, the second woman -- who was dressed in military camouflage -- pulled a handgun on Randolph while standing about a foot away, he told police.

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A struggle ensued as Randolph tried to wrest the gun, and the woman in camouflage yelled, "Mom, get in here!" Then a third woman -- dressed in a hood and a wig -- entered and joined the scrum, Randolph told police.

Randolph said he pulled off the third woman's wig and recognized her as an ex-girlfriend, Keren Blake. Then he realized that the woman in the military fatigues was Blake's daughter, Gollihugh, a Coast Guard servicewoman he had met before.

Randolph said he escaped the robbers by running outside and calling for help. He said the women rummaged through the home, stealing an Apple laptop and a Net10 prepaid cellphone, but apparently took nothing else before fleeing.

Novato police entered Randolph's home with his consent, finding what authorities described as a "large marijuana grow" inside. Randolph is already awaiting trial on marijuana-cultivation charges stemming from a raid at his home in April, when county drug investigators seized about 500 plants and two pounds of processed pot.

Randolph met Blake in December 2011 through an online dating site, Plenty of Fish. Police said he told them the relationship ended after Blake bought some items from him and her daughter paid with a $1,700 check that bounced.

Randolph told police he could not recall what Blake had purchased from him.

About a month ago, Blake surfaced again on Plenty of Fish, and Randolph confronted her via messaging about the bad check.

"Randolph said he was going to go after Gollihugh because he had her information from the bounced check she wrote to him," Cogan wrote in the affidavit. "Randolph said Blake began to vaguely threaten him by telling him she had connections with 'Hells Angels' and he should not mess with her."

Randolph told police he did not take the threat seriously and that he lost contact with Blake.

After the robbery, Novato police contacted the Coast Guard base at Two Rock to notify officials that Gollihugh was a suspect. A security official said Gollihugh was still in the service, but had received a dishonorable discharge that same day, Cogan said.

Later, when Gollihugh showed up at the base, she was detained by the Coast Guard and turned over to Novato investigators for questioning. Gollihugh waived her Miranda rights and told police that she, her mother and a friend, Mollie Blumberg, had planned the robbery in order to steal marijuana from Randolph, according to the affidavit.

Gollihugh said she dropped her camouflage hat at the scene and Blumberg dropped a cellphone battery.

Police arrested Blake on Nov. 1 at a homeless encampment in Petaluma. Blumberg, 21, was arrested Nov. 9 when police spotted her walking on a street in Petaluma.

No details were available on Gollihugh's military discharge, and a Coast Guard official declined to comment after her arrest. Gollihugh, a Texas native who had been in the Bay Area for about two years, was on a waiting list for training as a "maritime enforcement specialist" -- police-like personnel who board container ships and recreational boats.

Gollihugh was staying with a friend in Santa Rosa until she could return to Texas, according to a probation report.